Toothbrush

ABSTRACT

A toothbrush includes a handle, a head extending from the handle, and a tuft of bristles extending from the head. The tuft is inclined such that the angle of inclination is an acute angle relative to a surface of the head through which the tuft extends. The bristles have free ends which define a plane, the plane being other than perpendicular to a direction in which the tuft extends from the head. The plane is inclined towards the same direction in which the tuft is inclined.

FIELD OF THE INVENTION

[0001] The invention relates generally to the field of oral care, and inparticular to toothbrushes.

BACKGROUND OF THE INVENTION

[0002] U.S. Pat. No. 2,242,743 discloses a toothbrush having a handle12, a head 14, and a plurality of tufts 16 of bristles which extendoutward from the head. The tufts are positioned at an acute or obtuseangle with respect to the handle and head. The bristles provide a seriesof transverse, broad, inverted V-shaped areas on the working surface 18.The free ends of the bristles of each tuft form a surface which isinclined away from the direction in which the tuft is inclined.

[0003] U.S. Pat. No. 3,085,273 discloses a toothbrush having a handle 10with an elongated head portion 12 formed integrally with the head.Bristles 14 are mounted in the head portion and are formed in tufts 15.The tufts are arranged in parallel rows 16, 16′ longitudinally of thehead and inclined in the direction of the rows. The free end of thebristles of each tuft define a plane which is perpendicular to thedirection in which the tuft extends from the head.

SUMMARY OF THE INVENTION

[0004] Briefly summarized, according to one aspect of the presentinvention, a toothbrush includes a handle, a head extending from thehandle, and a tuft of bristles extending from the head. The tuft isinclined such that the angle of inclination is an acute angle relativeto a surface of the head through which the tuft extends. The bristleshave free ends which define a plane, the plane being other thanperpendicular to a direction in which the tuft extends from the head.The plane is tilted towards the same direction in which the tuft isinclined.

[0005] These and other aspects and features of the present inventionwill be more clearly understood and appreciated from a review of thefollowing detailed description of the preferred embodiments and appendedclaims, and by reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0006]FIG. 1 is a perspective view as seen from the top, front and leftside of a brush bristle pattern;

[0007]FIG. 2 is a top plan view thereof;

[0008]FIG. 3 is a left side elevational view thereof, the right sideelevation being a mirror image thereof;

[0009]FIG. 4 is a bottom plan view thereof;

[0010]FIG. 5 is a rear elevational view thereof;

[0011]FIG. 6 is a front elevational view thereof;

[0012]FIG. 7 is a perspective view as seen from the top, front and leftside of a second embodiment of a brush bristle pattern;

[0013]FIG. 8 is a top plan view thereof;

[0014]FIG. 9 is a left side elevational view thereof, the right sideelevation being a mirror image thereof;

[0015]FIG. 10 is a bottom plan view thereof;

[0016]FIG. 11 is a rear elevational view thereof; and

[0017]FIG. 12 is a front elevational view thereof

DETAILED DESCRIPTION OF THE INVENTION

[0018] Beginning with FIGS. 1-6, a toothbrush 20 includes a handle 22(only a portion thereof being shown in the drawings) and a head 24extending from the handle. A tuft of bristles 26 extends from head 24and is inclined away from handle 22 such that the angle of inclinationis an acute angle relative to a surface 28 of the head through which thetuft extends. The bristles of tuft 26 have free ends which define aplane 30, the plane being other than perpendicular to a direction 32(see FIG. 3) in which the tuft extends from the head. Plane 30 isinclined towards the same direction (away from handle 22) in which tuft26 is inclined.

[0019] A second tuft of bristles 34 extends from head 24, the secondtuft being adjacent tuft 26 and being inclined in the same direction astuft 26. The angle of inclination of tuft 34 is an acute angle relativeto surface 28. The bristles of tuft 34 have free ends which define aplane 36, this plane being other than perpendicular to direction 32 inwhich tuft 34 extends from head 24. Plane 36 is inclined away from tuft26. Plane 30 of tuft 26 is inclined away from tuft 34. Tuft 26 and tuft34 are arranged in a row 37 which is oriented substantially along alongest dimension 38 of head 24.

[0020] Third and fourth tufts of bristles 40 and 42 correspond aspreviously described respectively to tuft 26 and second tuft 34 ofbristles except that third and fourth tufts 40, 42 are inclined insubstantially the opposite direction (towards handle 22) to tuft 26 andsecond tuft 34. Third and fourth tufts 40, 42 are arranged in a secondrow 44 of tufts which is adjacent to row 37 of tuft 26 and second tuft34.

[0021] Fifth and sixth tufts of bristles 46, 48 correspond as previouslydescribed respectively to the third 40 and fourth 42 tufts of bristles.The fifth and sixth tufts are arranged in a third row 50 of tufts whichis adjacent to the second row 44 of tufts.

[0022] Seventh and eighth tufts 52, 54 of bristles correspond aspreviously described respectively to tuft 26 and second tuft 34 ofbristles. The seventh and eighth tufts are arranged in a fourth row oftufts 56 which is adjacent to third row of tufts 50.

[0023] Turning to FIGS. 7-12, a second embodiment of the invention willbe described. A toothbrush 60 includes a handle 62 (only a portionthereof being shown in the drawings) and a head 64 extending from thehandle. A tuft of bristles 66 extends from head 64 and is inclined awayfrom handle 62 such that the angle of inclination is an acute anglerelative to a surface 68 of the head through which the tuft extends. Thebristles of tuft 66 have free ends which define a plane 70, the planebeing other than perpendicular to a direction 72 (see FIG. 9) in whichthe tuft extends from the head. Plane 70 is inclined towards the samedirection (away from handle 62) in which tuft 66 is inclined.

[0024] A second tuft of bristles 74 extends from head 64, the secondtuft being adjacent tuft 66 and being inclined in the same direction astuft 66. The angle of inclination of tuft 74 is an acute angle relativeto surface 68. The bristles of tuft 74 have free ends which define aplane 76, this plane being other than perpendicular to direction 72 inwhich tuft 74 extends from head 64. Plane 76 is inclined away from tuft66. Plane 70 of tuft 66 is inclined towards tuft 74. Tuft 66 and tuft 74are arranged in a row of tufts 77 which is oriented substantially alonga longest dimension 78 of head 64.

[0025] Third and fourth tufts of bristles 80 and 82 correspond aspreviously described respectively to tuft 66 and second tuft 74 ofbristles except that third and fourth tufts 80, 82 are inclined insubstantially the opposite direction (towards handle 62) to tuft 66 andsecond tuft 74. Third and fourth tufts 80, 82 are arranged in a secondrow 84 of tufts which is adjacent to row 77 of tuft 66 and second tuft74.

[0026] Fifth and sixth tufts of bristles 86, 88 correspond as previouslydescribed respectively to the third 80 and fourth 82 tufts of bristles.The fifth and sixth tufts are arranged in a third row 90 of tufts whichis adjacent to the second row 84 of tufts.

[0027] Seventh and eighth tufts 92, 94 of bristles correspond aspreviously described respectively to tuft 66 and second tuft 74 ofbristles. The seventh and eighth tufts are arranged in a fourth row oftufts 96 which is adjacent to third row of tufts 90.

[0028] Referring back to FIGS. 1-6, further tufts on toothbrush 20 willbe described. A tuft of bristles 106 extends from head 24 and isinclined away from handle 22 such that the angle of inclination is anacute angle relative to a surface 28 of the head through which the tuftextends. The bristles of tuft 106 have free ends which define a plane110, the plane being other than perpendicular to a direction 32 (seeFIG. 3) in which tuft 106 extends from the head. Plane 110 is inclinedtowards the same direction (away from handle 22) in which tuft 106 isinclined.

[0029] A second tuft of bristles 114 extends from head 24, the secondtuft being adjacent tuft 106 and being inclined in the same direction astuft 106. The angle of inclination of tuft 114 is an acute anglerelative to surface 28. The bristles of tuft 114 have free ends whichdefine a plane 116, this plane being other than perpendicular todirection 32 in which tuft 114 extends from head 24. Plane 116 isinclined towards tuft 106. Plane 110 of tuft 106 is inclined towardstuft 114. Tuft 106 and tuft 114 are arranged in row of tufts 37.

[0030] Third and fourth tufts of bristles 120 and 122 correspond aspreviously described respectively to tuft 106 and second tuft 114 ofbristles except that third and fourth tufts 120, 122 are inclined insubstantially the opposite direction (towards handle 22) to tuft 106 andsecond tuft 114. Third and fourth tufts 120, 122 are arranged in asecond row 44 of tufts which is adjacent to row 37 of tuft 106 andsecond tuft 114.

[0031] Fifth and sixth tufts of bristles 126, 128 correspond aspreviously described respectively to the third 120 and fourth 122 tuftsof bristles. The fifth and sixth tufts are arranged in a third row 50 oftufts which is adjacent to the second row 44 of tufts.

[0032] Seventh and eighth tufts 132, 134 of bristles correspond aspreviously described respectively to tuft 106 and second tuft 114 ofbristles. The seventh and eighth tufts are arranged in a fourth row oftufts 56 which is adjacent to third row of tufts 50.

[0033] The invention has been described with reference to preferredembodiments. However, it will be appreciated that variations andmodifications can be effected by a person of ordinary skill in the artwithout departing from the scope of the invention.

1. A toothbrush, comprising: a handle; a head extending from the handle;and a tuft of bristles extending from the head, the tuft being inclinedsuch that the angle of inclination is an acute angle relative to asurface of the head through which the tuft extends, the bristles havingfree ends which define a plane, the plane being other than perpendicularto a direction in which the tuft extends from the head, the plane beinginclined towards the same direction in which the tuft is inclined. 2.The toothbrush of claim 1 , further comprising: a second tuft ofbristles extending from the head, the second tuft being adjacent thetuft and being inclined in the same direction as the tuft, the angle ofinclination of the second tuft being an acute angle relative to asurface of the head through which the second tuft extends, the bristlesof the second tuft having free ends which define a plane, this planebeing other than perpendicular to a direction in which the tuft extendsfrom the head, this plane being inclined away from the tuft.
 3. Thetoothbrush of claim 2 , wherein the plane of the free ends of thebristles of the tuft is inclined away from the second tuft, the tuft andsecond tuft being arranged in a row which is oriented along a longestdimension of the head.
 4. The toothbrush of claim 3 , furthercomprising: third and fourth tufts of bristles which correspond aspreviously described respectively to the tuft and second tuft ofbristles except that the third and fourth tufts are inclined insubstantially the opposite direction to the tuft and second tuft, thethird and fourth tufts being arranged in a second row which is adjacentto the row of the tuft and second tuft.
 5. The toothbrush of claim 4 ,further comprising: fifth and sixth tufts of bristles which correspondas previously described respectively to the third and fourth tufts ofbristles, the fifth and sixth tufts being arranged in a third row whichis adjacent to the second row of tufts.
 6. The toothbrush of claim 5 ,further comprising: seventh and eighth tufts of bristles whichcorrespond as previously described respectively to the tuft and secondtuft of bristles, the seventh and eighth tufts being arranged in afourth row which is adjacent to the third row of tufts.
 7. Thetoothbrush of claim 2 , wherein the plane of the free ends of thebristles of the tuft is inclined towards the second tuft, the tuft andsecond tuft being arranged in a row which is oriented along a longestdimension of the head.
 8. The toothbrush of claim 7 , furthercomprising: third and fourth tufts of bristles which correspond aspreviously described respectively to the tuft and second tuft ofbristles except that the third and fourth tufts are inclined in theopposite direction to the tuft and second tuft, the third and fourthtufts being arranged in a second row which is adjacent to the row of thetuft and second tuft.
 9. The toothbrush of claim 8 , further comprising:fifth and sixth tufts of bristles which correspond as previouslydescribed respectively to the third and fourth tufts of bristles, thefifth and sixth tufts being arranged in a third row which is adjacent tothe second row of tufts.
 10. The toothbrush of claim 9 , furthercomprising: seventh and eighth tufts of bristles which correspond aspreviously described respectively to the tuft and second tuft ofbristles, the seventh and eighth tufts being arranged in a fourth rowwhich is adjacent to the third row of tufts.
 11. The toothbrush of claim1 , further comprising: a second tuft of bristles extending from thehead, the second tuft being adjacent the tuft and being inclined in thesame direction as the tuft, the angle of inclination of the second tuftbeing an acute angle relative to a surface of the head through which thesecond tuft extends, the bristles of the second tuft having free endswhich define a plane, this plane being other than perpendicular to adirection in which the tuft extends from the head, this plane beinginclined towards the tuft.
 12. The toothbrush of claim 11 , wherein theplane of the free ends of the bristles of the tuft is inclined towardsthe second tuft, the tuft and second tuft being arranged in a row whichis oriented along a longest dimension of the head.
 13. The toothbrush ofclaim 12 , further comprising: third and fourth tufts of bristles whichcorrespond as previously described respectively to the tuft and secondtuft of bristles except that the third and fourth tufts are inclined inthe opposite direction to the tuft and second tuft, the third and fourthtufts being arranged in a second row which is adjacent to the row of thetuft and second tuft.
 14. The toothbrush of claim 13 , furthercomprising: fifth and sixth tufts of bristles which correspond aspreviously described respectively to the third and fourth tufts ofbristles, the fifth and sixth tufts being arranged in a third row whichis adjacent to the second row of tufts.
 15. The toothbrush of claim 14 ,further comprising: seventh and eighth tufts of bristles whichcorrespond as previously described respectively to the tuft and secondtuft of bristles, the seventh and eighth tufts being arranged in afourth row which is adjacent to the third row of tufts.
 16. Thetoothbrush of claim 1 , wherein the tuft is inclined towards the handle.17. The toothbrush of claim 1 , wherein the tuft is inclined away fromthe handle.